The HAM series rotors are very simple devices,
easily repaired by anyone who can use a screwdriver.
Replacement parts are readily available from HyGain
and possibly the usual repair places.
The problem you describe could be dirt on the wirewound
potentiometer and/or wiper arm, or the ground connection
between the copper "grabber" and the aluminum housing.
Clean all the contact areas and bend the copper to provide
a little more tension. Be sure to note the alignment of the
housings BEFORE you separate them. Also note the
position of the copper "gripper" that rotates the wiper of
the potentiometer.
While you have the rotor down, consider replacing the
connector with a plug in unit, or at least replace the
rusty screws with stainless steel screws available
from hardware stores or fastener supply houses.
A low wide plastic tub is a useful aid in preventing
ball bearings from escaping when you remove them
from the channel. Mineral spirits will clean the old grease
off. Use a good all temperature grease in the channel and
on the gears if you decide to regrease them as well.
Be sure to only use a small amount of grease (the manual
says a thimble full will do a complete rotor).
A post in the ground or in a vice helps position the rotor
while you work on it.
de Tom N4KG
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